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Returns a keybinding which can be used to activate this action. The string returned should contain localized, human-readable, key sequences and should be in the format "mnemonic;sequence;shortcut" with each modifier key enclosed in angle brackets.

Example: For a traditional "New..." menu item, the expected return value would be:
"n;<Alt>f:n;<Control>n".

Details:
The mnemonic key activates the object if it is presently enabled onscreen. This typically corresponds to the underlined letter within the widget. Example: "n" in a traditional "New..." menu item.

The sequence is the full list keys which invokes the action even if the relevant element is not currently posted on screen (for instance, for a menu item it posts the parent menus before invoking). The sequence string is colon-delimited. Example: "<Alt>f:n" in a traditional "New..." menu item.

The shortcut, if it exists, will invoke the same action without posting the component or its enclosing menus or dialogs. Example:"<Control>n" in a traditional "New..." menu item.